DDR4 Overview
With DDR3 reaching its limits in a world that demands higher performance and increased bandwidth, a new generation of DDR SDRAM has arrived. Staefa control systems vav manual. DDR4 delivers higher performance, higher DIMM capacities, improved data integrity and lower power consumption.
![Ddr4 ram in ddr3 slot Ddr4 ram in ddr3 slot](https://images.anandtech.com/doci/9411/1%20-%20H170Z3.jpg)
Achieving more than 2Gbps per pin and consuming less power than DDR3L (DDR3 Low Voltage), DDR4 provides up to 50 percent increased performance and bandwidth while decreasing the power consumption of your overall computing environment. This represents a significant improvement over previous memory technologies and a power savings up to 40 percent
In addition to optimized performance and greener, low-cost computing, DDR4 also provides cyclic redundancy checks (CRC) for improved data reliability, on-chip parity detection for integrity verification of ‘command and address’ transfers over a link, enhanced signal integrity and other robust RAS features.
The DDR4 is the newer and updated technology, so it’s a no-brainer that obviously it would be more expensive as compared to the DDR3 modules. For example, you can get the 8GB kit of ADATA DDR3-2133 for $59.29 only, whereas the comparative DDR4-2133 will set you back at $91.49, almost a $30 difference. The DDR4 form factor is optimized for the latest DDR4 systems and offers higher frequencies, greater bandwidth, and lower power consumption than DDR3 modules. VENGEANCE LPX DDR4 modules are compatibility-tested across DDR4 systems for reliably fast performance. There’s XMP 2.0 support for trouble-free automatic overclocking.
DDR4 Details
Please note that there are subtle differences between DDR3 and DDR4 modules.
Key notch difference
Using Ddr4 In Ddr3 Slot
The key notch on a DDR4 module is in a different location from the key notch on a DDR3 module. Both notches are located on the insertion edge but the notch location on the DDR4 is slightly different, to prevent it the module from being installed into an incompatible board or platform.
Increased thickness
DDR4 modules are slightly thicker than DDR3, to accommodate more signal layers.
Curved edge
DDR4 modules feature a curved edge to help with insertion and alleviate stress on the PCB during memory installation.
Specifications at a Glance
Description | DDR3 | DDR4 | Advantage |
---|---|---|---|
Chip Densities | 512Mb-8Gb | 4Gb-16Gb | Larger DIMM Capacities |
Data Rates | 800Mb/s – 2133Mb/s | 1600Mb/s – 3200Mb/s | Migration to Higher-Speed I/O |
Voltage | 1,5V | 1,2V | Reduced Memory Power Demand |
Low Voltage Standard | Yes (DDR3L at 1.35V) | Anticipated at 1.05V | Memory Power Reductions |
Internal Banks | 8 | 16 | More Banks |
Bank Groups (BG) | 0 | 4 | Faster Burst Accesses |
VREF inputs | 2 – DQs and CMD/ADDR | 1 – CMD/ADDR | VREFDQ Now Internal |
tCK – DLL Enabled | 300MHz – 800MHz | 667MHz – 1,6GHz | Higher Data Rates |
tCK – DLL Disabled | 10MHz – 125MHz (optional) | Undefined to 125MHz | DLL-off now fully supported |
Read Latency | AL + CL | AL + CL | Expanded Values |
Write Latency | AL + CWL | AL + CWL | Expanded Values |
DQ Driver (ALT) | 40 Ω | 48 Ω | Optimal for PtP Applications |
DQ Bus | SSTL15 | POD12 | Less I/O Noise and Power |
RTT Values (in Ω) | 120, 60, 40, 30, 20 | 240, 120, 80, 60, 48, 40, 34 | Support for Higher Data Rates |
RTT Not Allowed | READ Bursts | Disables during Read Bursts | Ease-of-Use |
ODT Modes | Nominal, Dynamic | Nominal, Dynamic, Park | Add’l Control Mode; OTF Value Change |
ODT Control | ODT Signaling Required | ODT Signaling NOT Required | Ease of ODT Control; Allows Non-ODT Routing, PtP Apps |
Multi-Purpose Register | Four Registers – 1 Defined, 3 RFU | Four Registers – 3 Defined, 1 RFU | Provides Additional Specialty Readout |
DIMM Types | RDIMM, LRDIMM, UDIMM, SODIMM | RDIMM, LRDIMM, UDIMM, SODIMM | |
DIMM Pins | 240 (R, LR, U); 204 (SODIMM) | 288 (R, LR, U); 260 (SODIMM) | |
RAS | ECC | CRC, Parity, Addressability, GDM | More RAS features; improved data integrity |
Are DDR3 and DDR4 laptop memory (RAM) compatible? That’s a common question when it comes to memory upgrades. For instance, you bought a new laptop with DDR4 RAM and want to add more memory to it by inserting a DDR3 RAM module from your older laptop. You wonder if that’s possible. Unfortunately, that can’t be done. DDR3 and DDR4 laptop memory are not compatible / interchangeable.
Ddr4 Ram In Ddr3 Slot
![Slot Slot](https://www.overclock3d.net/gfx/articles/2015/06/01071436393l.jpg)
First of all, a DDR3 laptop RAM module can’t physically fit into a DDR4 laptop RAM slot and vice versa. Notches on the connectors of memory sticks are on different places. The same applies to corresponding bumps in the RAM slots on notebook’s motherboards. Also, the number of pins doesn’t match. A DDR3 laptop memory module has 204 pins, whereas DDR4 has 260. Finally, DDR3 memory is a bit shorter than DDR4 – 2.66 versus 2.74 inches.
Adobe flash media live encoder for mac. So, a DDR3 memory module won’t fit in a DDR4 slot…
And a DDR4 stick is incompatible with a DDR3 slot…
Besides the physical differences, DDR3 and DDR4 RAM differ in voltages. DDR3 uses a voltage of 1.5V (or 1.35V for DDR3L variant). DDR4 uses 1.2V. It is more power efficient and generally faster, but doesn’t noticeably improve overall performance nor battery life of notebooks.
Ddr4 In Ddr3 Slot Laptop
Note: If you see “SODIMM” in specs of both DDR3 and DDR4 laptop memory, that doesn’t mean they are compatible. SODIMM only means they are small memory modules commonly used in laptops and some small form factor PCs, as opposed to physically much bigger DIMM memory used in traditional desktop computers. As a side note, DDR3 and DDR4 DIMMs aren’t compatible neither.